Drill



Feb. 2 3 1926.

'A. W. LASHER DRILL Filed Nov. 13

. 1924 2 Sheets-Sheet 1 [NVENTOR 405950 W. AS/iff? ATTORNEYS.

Feb. 23 1926.

A. w. LASHER DRILL Filed Nov. 13,

2 Sheets-Sheet 2 a a. Zang @o Q INVENTOR. Abr/ 9160 WA 5MM BY ,v

. A TTORNEYS.

Paiement Feb. 23, ieee.

"UNITED DRILL.

Application filed November 13, 1924. Serial No. 7493210.

To all whom it may concern:

Be it known that ALFRED lV. Laetrile, a citizen of the 'United States, and a resident of Oakland, in the county of Alameda '5 and State of California, have invented a new and useful Drill, of which the following is a specification.

The present invention relates to improve-v ments in drills, particularly for deep Wells,

` and has for one of its particular objects to provide .means for building up a ,lining or casingv'for the Well during the actual drilling.,r operation.' lt is .proposed to utilize for this purpose a drill that is driven by means of an electric motor which latter is fixed relative to the drill and descends with the latter into the Well. It is proposed to combine with the housing for the said motor a casing surrounding;4 the same and forming an annular chamber With the ivall o'f the Well which latter lis filled progressively, heg-inlning from the top, With concrete at the saure Irate thatv "the drilling operation proceeds. For this purpose` an interior chamber is connected with the casing andv dry concrete disposed in this interior chamber ie tied into ,the outer chamber around the lower edge of the casing to unite 'with the liningjr previously formed so that the lining grows down- Wardly as the well grows in depth.

It is further proposed to coi'nbine with this casing means 'for eii'ectingg a perfect circulation ot Water from top to bottom and from bottom to top to car-rv olf the ipud from the bottom of the well.

A further object o the invention is to provide in connection with 'my drill a suitable drill bit that ywill enlarge the hole to maintain the desired outer diameter while 40 .it will collapse so as to clear 'the lining when the drill is pulled upwardly for the purpose ot' withdrawing the same.

r Other objects and advantages ot' my iu- (vcntion willy appear as the Specification proceeds. 1

The preferred Jforno of my invention is illustrated in the accompanying drawing, in

which -Figure 1 shows a vertical section through mydrilling unit. Figure 2 a horizontal section taken along line Ill-TH of Figure "i,

Figure 3 a horizontal o'ction taken along line Ill--Illl of Figure Figure i a top plan view of a hase plate for the drillingl unit.

Figure 5a section taken along line 117-37 of Tigu're Il. l A

Figure 6, a top plan view of 4a ring or washer forming the bottom ci the chamber to be filled, with concrete.

Figure 7 a vertical section through the same taken along line Vil-VH oli Figure 6 VFigure 8 a vertical section through the lower part of the drilling unit, talen at right angles to that shown in Figure l.

Figure 9 a vertical section through the drill hit arrangement, and Figure l0 a fragmentary cross Section taken along line X X. of Figure l.

While I have shown only the preferred Jform 'of the invention, it shouldhe understood that various changes or modifications may be made within the ecopeo'l5 the claims 75 hereto attached Without departing, from the Y, spirit of the invention.

The power plant for my drill comprises a cylindrical motor housing l, having field windings secured thereto and an armature on 30 the hollow shalt 4f revolvaiole in the tiel/d. The shalt terminates at a distance from the bottom ot the motor housingy in the drill hit (i, which may he or' any suitable form and which is shown in the drawing as compris-` ing around hottoin face 7 lrnurled to attack the central portion oi' the bottom of the woll when the Shaft is rotated. il. plurality of arme 8 are adapted to swing, in radial recefiscs 9 of the drill hit and are provided no :it their inner ends with halls ll mounted for universal motion in spherical sockets l2v so that the arms may revolve on their own axes when the drill is rotated. .dit 'the outer ends of the arms 8 l provide heavy Weights lf3 preferably hall shaped, with toothed or knul-lcd surfaces 14 to hreaf; up an annular portion around the central part of the hottorn of the Well. It will be notedfthat when ythe'motor housing ie drawn upwardly by means or" the cable 16, the weights 13 -will drop downwardly and will allow the same lto he withdrawn throiigh a hole smaller than the one drilled. A

The motor is mounted within an; annular chamber 17 formed between two casings 18, 19, which latter hasl aplurulitg.r of vertical vtubes 21, formed integral therewith, the

' in Figure 8.

inner' faces of the tubes connecting with the inner easing 18, as shown at 22, and being" Welded thereto. The two casings 18,:19, are connected at the top, as shown at 23, but the tubes 21 are open on top as well as at the bottom.v As shown' in Figure S, the 1n- `ner casing 18 extends slightly below the outer casing 19 andengages with an annular' groove 2i in the base plat-e 26 which latter is ot' a diameter to come .flush with the outer face of the outer casing` and is notched as shown at 27v to accommodate the tubes 21. The armature shaft 4 extends through the base plate 26 and packing 28 i'orced into a recess 29by means of the gland 31 insures against leakage of water and mud past the base plate. The outer edge of thelatter plate rests on a ledge 32 of the washer 33 which latter extends to the wall of the well as originally drilled and forms the bottom of a chamber 34 surrounding the outer casing 19. The washer 33 which is preferably made of rubber or similar elastic material is also provided with recesses 3G to allow the tubes 2l to extend therethrough. lt will be seen that inthis'manner the two annular chambers 34 and 17 as well as the motor housing are completely protected against moisture from the bottom, while the pipes 2l allow water to circulate therethrough trom` top to bottom or bottom to .top respectively. To regulate the flow of water, I preferably provide spiral conveyors 3T in two of the tubes, the conveyors being' actuf ated from the motor shaft 4 by the chain drive 38 so thatwater is made to ascend in these two tubes lwhile the other tubes allow the water to descend therein. 4

The motor housing has lateral wings 3%) extending therefrom which ride in grooves 4 1 formed between ribs 42 so to prevent revolvingl motion of-the motor housing rela.- tive to the inner casing. Above the motor housingv I provide a reservoir 43 for compressed air having an outlet 44. leading into the chamber 17 between the inner and outer` oasings. The space between the reservoir and the base plate is sullieiently large to allow of slight upward. and downward play of the casings relative to themotor housing.

Before the whole unit is introduced into the well for the purpose of deepening the same, it is turned upside down and the inner chamber 17 formed between the two casings 1S and 19 is filled or partly filled with concrete material in a dry state. The base plate 2G -then applied and the lwasher $525 plat-ezt around the same in the manner illustrated The ydevice is then lowered into the well by means of the cable 1'6 which ylatter is preferably also used asv a conduit for wires to the windings ol the motor. After the drill bit has reached or come within close proximity ot the bottom of the well, the motor is started and the centrifugal lmaterial and the washer 33.

' other tubes.

force of the rotary motion of the drill bix swings the arms 8 upwardly sothatafter the bottom has been reached, the central drill'bit aiid the Weights or balls 1 3 cooper ate `in deepening the well throughout its eircumference. AThe two casings 18 and 19 descend within the,v well but are raised by the concreteniaterial forced around the lower edge of the outer casing,r so that the bottom of the outer easing clears thebase plate 26, as illustrated in Figure 8.

Sutiicient moisture will penetratethe concrete after the same has entered the outer chamber from-the earth material surroundV ing' the well to cause the concrete to harden and to provide a substantial wall or lining;l

for the well. ln this manner'the wall oroy lining 84 is ajdded to continuously and the same 'grows downwardly at the same rate of speed as the drill proceeds to deepen the well hole, the newly entering,r concrete being confined between previously formed lining.;` Constant air pressure is maintained in the chamber between the two rasings through pressure regulator 45 in the pipe 441 from the reser-A voir 43 so that the dry Concrete material is positively forced around the lower edge of the outer casing and always tends to till` all the available space of the outer chamber. Tater circulates in the meantime through the tubes 21 .being carried upward by the conveyors 3T in two of the tubes and descending correspondingly in the two The mud carried upward by the conveyors is discharged centrally and collects within the inner easing on top 'of the reservoir 43, a tube 46 surrounding the cable to prevent the mud from entering the room accommodating the motor housing.

From time to time, the whole unit is lifted' vby means of the cable 1G, the mud dumped out of the upper portion of the inner casing, the inner chamber relilled "'ith dry con-` crete, new air introduced in Lne reservoir.

43 through any suitable intake as the valved p ipe :50 andthe core that may have formed in the hollow shaf t -l is removed, whereupon thesame operation may be repeated It is understood that when the unit iswithdrawn. the motor housing engaging the lower face of thevreservoir 43 raises the entire casingY rstructure and therebyv lilts the whole unit lll() except the washer 33 which remains in its place, while the arms S ot' the drill bit drop downwardly so as to allow the rballs 13 to pass through the reduced opening of the well. lt willbe understoodthat during the actual drilling opeiratiom'the weight of the motor housing;- forces the base plate 2G and the washer 33 downwardly while the air pre ure behind the dry concrete mixture causes the two casingrs to `float on the concrete escaping around the lower-edge.

While in the above description reference is had to dry concrete material, it should be mentioned that under certain conditiona, yparticularly when th-e operation..procceds rery'fast, wet concrete material ma@7 be preferred.

l claim:

l. A drill of the character filescrillied, an annular chamber, meau t'or c'aiaingthe latter to travel downwarilj; with the drill and means for discharging material from the bottom of the Said chamber to the outside thereof for building up a lining in the hole drilled during the drilling operatiom the said chamber ha meaml arfsociated there with allowing -water to circulate therethrough to the bottoni ot the hole without coming in Contact with the lining material.

2.'.In a drill. a drill bit. an electric motor for driving the same iixcd relative thereto and includingr a stationary motor homing and a revolving shaft`v and au annular chamberV surrounding the motor housing mounled 'for' limited sliding motion relative thereto and holding the same against rotation naring meansiassociated therewith tor-building up a lining around the'same during the drilling operation. y

il. In a drill, a drill bit, an electric motor for driving the same fixed relative thereto and including a stationary motor housing and a revolving shaft, and an annular chamber surrounding the motor housing mounted for limited sliding motion relative thereto and holding thesame against rotation having means associated therewith tor building up a lining around the Same during the drilling operation. the isaid chamber being formed to interlock with the lining 'for preventing rotary motion ot' the chamber.

4. Ina drill, a drill hit. an electric motor for driving-the Same fixed relative thereto 'and' including a `Stationary motor housing and a revolving shaft, and an annular chambersurrounding the motor housing mounted 'for limited sliding motion relative thereto and holding the same' against rotation having means associated therewith for building up a lininigT arolind the same during the drilling operation,A the `aaid chamber having yertical water circulating pipescenfbodied therein formed to interlock with the lining for preventing rotary motion of the latter.

ln combination with a drill'ot' fthe character described, a drill bit comprising 5 a central element adapted to attack acentrai part of the bottom of a. well when the drill is rotated and arms pivoted therein to swing in radial planes having weights secured at the ends thereof made' to engage with an outer concentricportion of the well bottom for enlarging the hole.;

G. In combination with a4 drill of the character described, a drill bet comprising a central element adapted toattack a 'central )art of the bottom of a well.when the drill is l-rotated and arms pivoted therein tt. swing in radial .planes having weights secured at the ends thercot`- made to engage with an outer concentric portion of the well bottom for enlarging the hole.. the `arms being mounted with freedom of revolving on their own axes.

- 7. A drill of the.. character described. a 'casing associated therewith forming an an- ,nular chambeinwith' the all of the hole drilled and means, for building up a lining in said chamber comprising a second'casing fixed in concentric relation to the first casing so as to form an `annular chamber therewith-adapted to have lining material disposed therein and means for forcing the said material around the`bottom edge of the casing during the drilling operation. i 8. In well drilling apparatus, hole drilling mechanisnufand means functioning in time with the drilling of a hole by said mechanism to apply a plastic material to the walls of said hole. and means Separating the lirst said means from laid mechanism t0 exclude liquid from the plastic faced walls formed by said first means.

l). In means for -drilling a welll and for lining the walls of the well with plastic material, scaling means for subdividing the well into a pluralityT of non-communicating spaces, hole drilling mechanism adapted to operate in one of said spaces and wall lining mechanism adapted to operate in the other of `aid spaces.

10. ln mechanism of thc class described, a drill,.mof1n. tor applying plastic c ating material to the walls of a hole produced by the drill. means l'or excluding liquid from the plastic material during the procesa of applying it to lwaid walls. and means for automatically conveying liquid and .rediment away from the mechanism progressively .with actions of the drill.

Linnen W. LAsHE-i motion 

